Talon I saw that one two, man did I get pissed! The rest of the featurettes are safe. Except obviously the behind the scenes look at episode 3 itself. I also know about a spoiler in the commentary of Episode VI during the jedi ghost scene

One of the featurettes is called the Return of Darth Vader or something, and is known as the "Episode 3" one. Well a friend was talking to me about it, and I told him I don't want to see it or know anything about it until after Episode 3. He told me that he was disappointed because it doesn't really show anything about Episode 3... that it's all just about them remaking the Vader costume. I'm still not gonna see it, but that does sound kinda tame.